M-H facts

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Jun 19, 2009 | 01:18 PM

51MHF5

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From: Bearspaw Alberta Canada

M-H facts

My truck won't be delivered until Sunday now, dangit! But I'm wondering about the Marmon-Herrington conversion. What kind of gears were standard, type and weight of gear oil, was it offered with any type of locker or can you retro a limited slip or locker into it?

Thanks,
Rab

Jun 19, 2009 | 02:48 PM

truckdog62563

Marmon-Herrington Man

Joined: Jul 2005

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From: Central Illinois

My 1951 M-H "R" series chart shows your truck to have "6.67 - 1, Spiral Bevel, Single Reduction, 1 3/4" x 16 spline" axles. On standard two wheel drive models with single speed axles the optional ratios were 5.14, 5.83, and 6.67.

I don't have a manual for your truck, but for mine it says: "Use a straight mineral base gear oil. For transmission, auxiliary transmission and axle differentials use SAE-140 for summer and SAE-90 for winter. For Ford steering gear use SAE-90 for all seasons and for Ross steering gear use SAE-140 for all seasons." Maybe one of the guys with the bigger M-Hs can add or change that for your truck. With you living in Alaska, you might be staying with winter weight year round.

I don't know whether you could adapt a locker or limited slip, but I rather doubt it.

Jun 19, 2009 | 08:38 PM

51MHF5

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From: Bearspaw Alberta Canada

Not quite Alaska but you would of thought so this spring when we had snow right through into June. Southern Alberta is where I reside. I wrote to M-H and they sent me a copy of a manual along with a beautiful picture of their 51 F5 M-H with 1600 miles on it. Check out my gallery for their eye popping 51 F5 M-H. Giving me some great ideas for paint.

Jun 19, 2009 | 08:58 PM

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

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From: NM

Wow, are they still in business?! That is a beautiful truck! As far as those gear oil weights, Dick / 4TL8Ford had a post a couple years back where he converted the old weights to the new system. 140 back then is like 90wt now, something like that. Try a search for posts by him and "gear oil" or something.

Edit: here it is: https://www.ford-trucks.com/forums/6...ml#post6236281

Jun 19, 2009 | 09:15 PM

51MHF5

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From: Bearspaw Alberta Canada

Still in business, still doing the same thing, building great 4x4's

Jun 19, 2009 | 09:23 PM

truckdog62563

Marmon-Herrington Man

Joined: Jul 2005

Posts: 11,986

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From: Central Illinois

I'm impressed that they responded to you, and that they even had (much less shared) the manual with you. I emailed them a few years ago and got no reply. I pretty much dismissed it because I'd heard that they destroyed all their records when Ford pulled 4x4 production in-house in '59. Maybe the difference is that yours is a big truck. They've continued to this day to do the big truck conversions for Ford and others. That's a great pic.

Thanks for the link Ross, good info.

Sorry I had you in Alaska. Misremembered your profile info.